Optical response Optical properties 8 Artificial opals 6 Plasmonics 6 Plasmons 6 Probes 6 A-plane 4 Acoustic surface wave devices 4 Acoustic waves 4 Diffraction 4 Experimental confirmation 4 Front face 4 High-energy range 4 Incident fields 4 Korringa-Kohn-Rostoker method 4 Lattice resonances 4 Nano-structured 4 Nanoantennas 4 Near field scanning optical microscopy 4 Near-field pattern 4 Near-field scanning optical microscope 4 Numerical methods 4 Opal films 4 Optical correlation 4 Optical intensities 4 Outer surface 4 Periodic structures 4 Rear surfaces 4 Refractive index 4 Scanning near-field optical microscopy 4